How to intercept Remix-initiated transactions in MetaMask Snap and broadcast to a custom blockchain RPC?

I'm building a MetaMask Snap and I need help with the following use case:

• A user deploys a smart contract using Remix IDE.
• Instead of MetaMask directly sending the transaction to the default Ethereum RPC,
  I want the Snap to intercept the transaction.
• Then, the Snap should broadcast the transaction to a custom blockchain RPC URL (not the default Ethereum network).

My questions are:

1. Which Snap APIs are used to intercept or handle transactions initiated from Remix?
2. How can I prevent MetaMask from sending the transaction itself, and instead delegate it to the Snap?
3. Which permissions are required in the snap.manifest.json for:
   • Reading the transaction data.
   • Sending HTTP requests to a custom RPC endpoint.
4. Are there example code snippets or best practices for implementing this kind of custom transaction broadcasting logic inside a Snap?

Things I have found:

• I know Snaps can request endowment:network-access to make HTTP requests.
• I know about wallet_snap methods for invoking custom Snap methods.
• But I couldn't find clear docs about intercepting Remix deployments (or eth_sendTransaction) specifically.

Any help or examples would be really appreciated!